Battery pack and electric device

Abstract

The invention discloses a battery pack and a power utilization device, the battery pack has a first direction and a third direction which are intersected, the battery pack comprises a battery pack and a busbar assembly, the battery pack comprises a plurality of single batteries arranged along the first direction, and the busbar assembly is arranged on one side of the battery pack along the third direction and is connected with the battery pack; the busbar assembly comprises a plurality of connecting parts and a flexible circuit board, the plurality of connecting parts are arranged on one side of the battery pack along the third direction, and each connecting part is connected with two adjacent single batteries along the first direction; the flexible circuit board is arranged on one side, away from the battery pack, of the connecting part and is conductively connected with the connecting part; the flexible circuit board is provided with a plurality of first through holes arranged in the first direction, and the first through holes penetrate through the flexible circuit board in the third direction; and the orthographic projection part of the connecting part on the flexible circuit board is located in the two adjacent first through holes. The busbar assembly is arranged to be the combination of the plurality of connecting parts and the flexible circuit board, so that the internal space occupation of the battery pack is effectively reduced.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a battery pack and an electrical device. Background Art

[0002] The battery pack composed of cylindrical batteries uses wiring harnesses to collect the voltage and temperature signals of the cylindrical batteries. However, the large number of wiring harnesses makes the battery pack assembly process complicated and occupies a large internal space of the battery pack. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a battery pack, aiming to solve the problem that the existing wiring harness collects the voltage and temperature signals of the battery, resulting in a large space being occupied inside the battery pack; another purpose of an embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A battery pack according to an embodiment of the present application has a first direction and a third direction intersecting each other, including:

[0005] A battery pack, comprising a plurality of single cells arranged along a first direction;

[0006] A bus assembly is arranged on one side of the battery pack along the third direction and connected to the battery pack; the bus assembly includes:

[0007] A plurality of connection parts are arranged on one side of the battery pack along the third direction, each of the connection parts being connected to two adjacent single batteries along the first direction;

[0008] A flexible circuit board is arranged on a side of the connecting portion away from the battery pack and is conductively connected to the connecting portion; the flexible circuit board has a plurality of first through holes arranged along the first direction, and the first through holes penetrate the flexible circuit board along the third direction; and a portion of the positive projection of the connecting portion on the flexible circuit board is located in two adjacent first through holes.

[0009] In some embodiments,

[0010] The single cell battery comprises:

[0011] ontology;

[0012] A first electrode is disposed on a side of the body facing the busbar assembly and is conductively connected to the body;

[0013] A second electrode is disposed on a side of the body facing the busbar assembly and is conductively connected to the body; a portion of the first electrode is protrudingly disposed on a side of the second electrode facing the busbar assembly;

[0014] Two adjacent single cells connected to one connecting portion are respectively a first cell and a second cell, and the connecting portion comprises:

[0015] A first section connected to a first electrode of the first battery;

[0016] A second section is arranged at one side of the first section along the first direction and connected to the first section; the second section is connected to the second electrode of the second battery, so that the first battery and the second battery are connected in series;

[0017] Wherein, at least part of the orthographic projection of the first segment on the flexible circuit board is located in a first through hole adjacent to the first segment; at least part of the orthographic projection of the second segment on the flexible circuit board is located in a first through hole adjacent to the second segment.

[0018] In some embodiments, the battery pack has a second direction intersecting the first direction and the third direction respectively; the second section includes:

[0019] a main body segment, connected to the first segment;

[0020] an extension section, arranged at one side of the main section along the second direction and connected to the main section; an end of the extension section away from the main section is bent along the first direction toward a direction away from the first section;

[0021] Wherein, the orthographic projections of at least a portion of the main body segment and the extension segment on the flexible printed circuit board are located within one of the first through holes.

[0022] In some embodiments, the connecting portion includes a transition section, one end of the transition section is connected to the first section, and one end of the transition section away from the first section is connected to the second section so that the second section is connected to the second electrode, and the first section is located along the third direction on the side of the first electrode away from the body.

[0023] In some embodiments, the connection portion has a thinned area, the thinned area is disposed in the first section, and the thinned area is configured to be melted when a current passing through the connection portion exceeds a threshold value.

[0024] In some embodiments, the first segment has a second through hole, the second through hole penetrates the first segment along the third direction, and the second through hole is exposed from the first through hole close to the first segment.

[0025] In some embodiments, the flexible circuit board includes a plurality of acquisition lines, each of which is conductively connected to one of the connecting parts, wherein a portion of the acquisition lines is located on one side of the first through hole along the second direction, and another portion of the acquisition lines is located on the other side of the first through hole along the second direction.

[0026] In some embodiments,

[0027] The battery pack has a second direction intersecting the first direction and the third direction respectively, the battery pack includes a plurality of the battery packs, and the plurality of the battery packs are arranged along the second direction;

[0028] The busbar assembly comprises:

[0029] A plurality of connectors are arranged at intervals along the first direction; along the third direction, the plurality of connectors are arranged between the plurality of battery packs and the flexible circuit board; the connectors are respectively connected to the plurality of battery packs and the flexible circuit board; the connector comprises at least one adapter and a plurality of connectors arranged at intervals along the second direction; each adapter is arranged between two adjacent connectors along the second direction and is respectively connected to the two connectors, so that two adjacent single batteries along the second direction are connected in parallel;

[0030] Along the third direction, one connecting portion of the connecting member is located between the flexible circuit board and one of the battery packs, and the connecting portion is exposed from two adjacent first through holes of the flexible circuit board.

[0031] In some embodiments, the busbar assembly further comprises:

[0032] A first insulating layer is disposed between the connecting portion and the single battery and connected to the connecting portion; the first insulating layer has a plurality of third through holes extending along the third direction, and the orthographic projections of the first segment and the second segment on the first insulating layer are respectively located in two adjacent third through holes;

[0033] The second insulating layer is arranged on a side of the flexible circuit board away from the connecting portion, and is respectively connected to the flexible circuit board, the connecting portion and the first insulating layer; the second insulating layer has a plurality of fourth through holes extending along the third direction, and the orthographic projections of the first segment and the second segment on the second insulating layer are respectively located in two adjacent fourth through holes.

[0034] Accordingly, an electrical device described in an embodiment of the present application includes a battery pack as described in any one of the aforementioned embodiments.

[0035] Beneficial effects: Compared with the prior art, a battery pack according to an embodiment of the present application has an intersecting first direction and a third direction, and includes a battery pack and a bus assembly, wherein the battery pack includes a plurality of single cells arranged along the first direction, and the bus assembly is arranged on one side of the battery pack along the third direction and connected to the battery pack; the bus assembly includes a plurality of connecting parts and a flexible circuit board, wherein the plurality of connecting parts are arranged on one side of the battery pack along the third direction, and each connecting part is connected to two adjacent single cells along the first direction; the flexible circuit board is arranged on a side of the connecting part away from the battery pack and is conductively connected to the connecting part; the flexible circuit board has a plurality of first through holes arranged along the first direction, and the first through holes penetrate the flexible circuit board along the third direction; and the orthographic projection of the connecting part on the flexible circuit board is located in two adjacent first through holes. The present application effectively replaces the wire harness for collecting signals by configuring the bus assembly as a combination of a plurality of connecting parts and a flexible circuit board, thereby effectively reducing the internal space occupied by the battery pack. At the same time, the flexible circuit board is provided with a first through hole, which can expose the two ends of the connection part connected to the two adjacent batteries, thereby preventing the flexible circuit board from blocking the electrode terminals of the single battery and the connection ends of the connection part, thereby facilitating the forming of the bus assembly first, and then welding the connection part of the bus assembly to the two adjacent single batteries, effectively simplifying the battery pack assembly process and improving the battery pack assembly efficiency; in addition, the flexible circuit board is overlapped with the connection part, which is not only conducive to the welding connection between the connection part and the flexible circuit board, but also exposes the two ends of the connection part only through the first through hole, which can increase the contact area between the flexible circuit board and the connection part, thereby improving the stability of the overall structure of the bus assembly.

[0036] Compared with the prior art, an electric device in an embodiment of the present application includes a battery pack as described in any one of the above embodiments. It is understandable that the electric device of the present application includes all the technical features and technical effects of the above battery pack, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 is a schematic diagram of the overall structure of a battery pack according to an embodiment of the present application;

[0039] Figure 2 It is a schematic diagram of the overall structure of a battery pack connected to a busbar assembly according to an embodiment of the present application;

[0040] Figure 3 is an exploded view of a battery pack and a busbar assembly according to an embodiment of the present application;

[0041] Figure 4 is a schematic structural diagram of a connector in an embodiment of the present application connected to a plurality of battery packs;

[0042] Figure 5 is a schematic structural diagram of a single cell according to an embodiment of the present application;

[0043] Figure 6 is a structural schematic diagram of a connector according to an embodiment of the present application;

[0044] Figure 7 It is a schematic diagram of the connection between the flexible circuit board and the connector and the wiring structure of the acquisition line in the embodiment of the present application;

[0045] Figure numerals: 1, battery pack; 11, single cell; 111, main body; 112, first electrode; 113, second electrode; 114, first battery; 115, second battery; 2, busbar assembly; 21, connector; 211, connecting portion; 2111, first section; 21111, second through hole; 2112, second section; 21121, main section; 21122, extension section; 2113, transition section; 2114, thinning area; 212, adapter; 22, flexible circuit board; 221, first through hole; 222, collection line; 23, first insulating layer; 231, third through hole; 24, second insulating layer; 241, fourth through hole; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0048] For large cylindrical battery packs, most of them are connected through wiring harnesses to the bus, temperature sensor and battery management system to complete the collection of voltage and temperature signals of the large cylindrical power battery pack. However, by using wiring harnesses to collect voltage and temperature signals, the number of wiring harnesses is large and they occupy a large space. At the same time, the assembly process of the large cylindrical power battery pack is more complicated and the labor cost is relatively increased, which is not conducive to industrial and efficient production.

[0049] In view of this, an embodiment of the present application provides a battery pack to solve the above-mentioned problem.

[0050] Please refer to Figure 1-Figure 7 A battery pack according to an embodiment of the present application has a first direction X and a third direction Z intersecting each other, and includes a battery pack 1 and a bus assembly 2. The battery pack 1 includes a plurality of single cells 11 arranged along the first direction X. The bus assembly 2 is arranged on one side of the battery pack 1 along the third direction Z and connected to the battery pack 1. The bus assembly 2 includes a plurality of connecting portions 211 and a flexible circuit board 22. The plurality of connecting portions 211 are arranged on one side of the battery pack 1 along the third direction Z. Each connecting portion 211 is connected to two adjacent single cells 11 along the first direction X. The flexible circuit board 22 is arranged on a side of the connecting portion 211 away from the battery pack 1 and is conductively connected to the connecting portion 211. The flexible circuit board 22 has a plurality of first through holes 221 arranged along the first direction X. The first through holes 221 penetrate the flexible circuit board 22 along the third direction Z. The orthographic projection of the connecting portion 211 on the flexible circuit board 22 is located in two adjacent first through holes 221.

[0051] In the embodiment of the present application, by configuring the bus assembly 2 to be a combination of a plurality of connection portions 211 and a flexible circuit board 22 , the wiring harness is effectively replaced for collecting signals, thereby effectively reducing the internal space occupied by the battery pack. At the same time, the flexible circuit board 22 is provided with a first through hole 221, which can expose the two ends of the connection part 211 connected to the two adjacent single cells 11, and prevent the flexible circuit board 22 from blocking the electrode terminals of the single cells 11 and the connection ends of the connection part 211, thereby facilitating the first molding of the bus assembly 2, and then welding the connection part 211 of the bus assembly 2 to the two adjacent single cells 11, effectively simplifying the battery pack assembly process and improving the battery pack assembly efficiency; in addition, the flexible circuit board 22 is overlapped with the connection part 211, which is not only conducive to the welding connection between the connection part 211 and the flexible circuit board 22, but also exposes the two ends of the connection part 211 only through the first through hole 221, which can increase the contact connection area between the flexible circuit board 22 and the connection part 211 (specifically, it can be an adhesive connection), and reduce the possibility of displacement of the flexible circuit board when the bus assembly 2 is welded to the single cell 11, thereby improving the stability of the overall structure of the bus assembly 2.

[0052] Specifically, in the embodiments of the present application, Figure 3 and Figure 7 As shown, the busbar electrically connects the flexible circuit board 22 and the multiple connecting parts 211. Specifically, multiple acquisition lines 222 are arranged in the flexible circuit board 22, each of which is electrically connected to a connecting part 211, and each of which is electrically connected to the battery management system. In this way, the voltage and temperature signals of multiple single cells 11 in the battery pack 1 can be collected by connecting the flexible circuit board 22 to the connecting part 211. At this time, the use of the flexible circuit board 22 effectively saves the space inside the battery pack and effectively reduces the volume of the battery pack.

[0053] It should be noted that the flexible circuit board 22 in the embodiment of the present application has a plurality of first through holes 221 arranged along the first direction X, and the first through hole 221 is used to expose the electrode end of a single battery 11 and one end of the connecting portion 211 along the first direction X, so that after the bus assembly 2 is arranged on one side of the battery pack 1, laser welding or other welding methods are used to connect one end of the connecting portion 211 to the electrode end of the single battery 11 from the side of the flexible circuit board 22 away from the battery pack 1, thereby realizing a rapid conductive connection between the bus assembly 2 and each single battery 11 of the battery pack 1. At this time, the bus assembly 2 can be grouped in advance before the battery pack is assembled as a whole (that is, the flexible circuit board 22 and the connecting portion 211 are grouped and conductively connected in advance, and the flexible circuit board 22 and the connecting portion 211 have sufficient contact connection area), effectively reducing the overall assembly process of the battery pack, thereby reducing the difficulty of battery pack assembly and improving the assembly efficiency of the battery pack.

[0054] like Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, the single battery 11 includes a body 111, a first electrode 112 and a second electrode 113, the first electrode 112 is arranged on a side of the body 111 facing the bus assembly 2, and is conductively connected to the body 111; the second electrode 113 is arranged on a side of the body 111 facing the bus assembly 2, and is conductively connected to the body 111; a portion of the first electrode 112 is protruded and arranged on a side of the second electrode 113 facing the bus assembly 2; two adjacent single batteries 11 connected to a connecting portion 211 are respectively a first battery 114 and a second battery 115, and the connecting portion 211 includes a first segment 2111 and a second segment 2112. 112, the first section 2111 is connected to the first electrode 112 of the first battery 114; the second section 2112 is arranged on one side of the first section 2111 along the first direction X and is connected to the first section 2111; the second section 2112 is connected to the second electrode 113 of the second battery 115, so that the first battery 114 and the second battery 115 are connected in series; wherein, the orthographic projection of the first section 2111 on the flexible circuit board 22 is at least partially located in a first through hole 221 adjacent to the first section 2111; the orthographic projection of the second section 2112 on the flexible circuit board 22 is at least partially located in a first through hole 221 adjacent to the second section 2112.

[0055] In the embodiment of the present application, the first electrode 112 and the second electrode 113 of the single cell 11 are arranged on the same side of the main body 111, and cooperate with the connection between the connecting portion 211 and the different electrodes of two adjacent single cells 11, so as to realize the series connection of two adjacent single cells 11, so as to realize the high voltage output of the battery pack 1.

[0056] Specifically, in the embodiment of the present application, the plurality of single cells 11 of the battery pack 1 may be square-shell batteries or cylindrical batteries. Figure 3 and Figure 5 As shown, the multiple single cells 11 of the battery pack 1 can preferably be cylindrical batteries, the first electrode 112 can be a positive electrode, and the second electrode 113 can be a negative electrode. In this case, the positive and negative electrodes of the single cells 11 are preferably on the same side. For cylindrical batteries, the negative electrode surrounds the outside of the positive electrode, and the positive electrode protrudes on the side of the negative electrode away from the shell, so that it is convenient for the connecting portion 211 to simultaneously connect the positive and negative electrodes of two adjacent batteries. The connecting portion 211 overlaps the positive and negative electrodes of two adjacent single cells 11 to achieve the series connection of the two adjacent single cells 11.

[0057] It can be understood that at least part of the orthographic projection of the first section 2111 on the flexible circuit board 22 is located in a first through hole 221 adjacent to the first section 2111; at least part of the orthographic projection of the second section 2112 on the flexible circuit board 22 is located in a first through hole 221 adjacent to the second section 2112. At this time, parts of the first section 2111 and the second section 2112 are respectively exposed from two adjacent second through holes 21111, so that it is convenient to realize that the first section 2111 and the second section 2112 of a connecting portion 211 are respectively connected to two adjacent single batteries 11.

[0058] like Figure 6 As shown, in some embodiments, the battery pack has a second direction Y intersecting with the first direction X and the third direction Z respectively; the second section 2112 includes a main section 21121 and an extension section 21122, and the main section 21121 is connected to the first section 2111; the extension section 21122 is arranged on one side of the main section 21121 along the second direction Y and is connected to the main section 21121; one end of the extension section 21122 away from the main section 21121 is bent along the first direction X toward a direction away from the first section 2111; wherein, at least part of the main section 21121 and the extension section 21122 have their orthographic projections on the flexible circuit board 22 located within a first through hole 221.

[0059] In the embodiment of the present application, the main section 21121 and the extension section 21122 cooperate with each other to form a groove facing the first electrode 112. At this time, it is beneficial to use the groove to realize the positioning of the first electrode 112, and it is beneficial to realize the assembly and mutual positioning of the battery pack 1 and the bus assembly 2, and facilitate the subsequent connection between the bus assembly 2 and the battery pack 1, which can specifically be a welding connection between the connecting portion 211 and the single battery 11.

[0060] It can be understood that the positive projection of at least part of the main section 21121 and the extension section 21122 on the flexible circuit board 22 is located in a first through hole 221. At this time, at least part of the main section 21121 and the extension section 21122 are exposed from a first through hole 221 along a third direction Z, which makes it convenient for external welding equipment to directly weld the main section 21121 and the extension section 21122 to the second electrode 113.

[0061] It should be noted that, in the embodiment of the present application, the second section 2112 can be provided with only one extension section 21122. In this case, a groove can be formed to limit the first electrode 112, and the second section 2112 and the second electrode 113 can be ensured to have sufficient welding connection area and current flow capacity; at the same time, it can ensure that the second section 2112 has a smaller size along the second direction Y, on the one hand, reducing the use of materials of the entire connecting portion 211 and reducing costs, and on the other hand, it can reduce the size of the first through hole 221 along the second direction Y while ensuring that at least part of the main section 21121 and the extension section 21122 are exposed from the first through hole 221. At this time, the acquisition line 222 can be wired at a position closer to the electrode, which is also conducive to reducing the size of the flexible circuit board 22 along the second direction Y, thereby reducing the use of materials of the flexible circuit board 22, and thereby reducing the cost of the flexible circuit board 22.

[0062] like Figure 4 and Figure 6 As shown, in some embodiments, the connecting portion 211 includes a transition section 2113, one end of the transition section 2113 is connected to the first section 2111, and one end of the transition section 2113 away from the first section 2111 is connected to the second section 2112, so that the second section 2112 is connected to the second electrode 113, and the first section 2111 is located along the third direction Z on the side of the first electrode 112 away from the main body 111.

[0063] In the embodiment of the present application, by providing the transition section 2113, it is possible to achieve that the first section 2111 is parallel to the second section 2112 and there is a distance difference between the first section 2111 and the second electrode 113, thereby achieving the connection between the first section 2111 and the first electrode 112 of the first battery 114, and the connection between the second section 2112 and the second electrode 113 of the second battery 115. It is ensured that the first section 2111 and the second section 2112 have sufficient contact areas with the electrodes to be connected.

[0064] like Figure 4 and Figure 6 As shown, in some embodiments, the connection portion 211 has a thinned area 2114, and the thinned area 2114 is disposed in the first section 2111, and the thinned area 2114 is configured to be melted when the current passing through the connection portion 211 exceeds a threshold value.

[0065] In the embodiment of the present application, the thinned area 2114 is provided to fuse the connection portion 211 when the current passing through the connection portion 211 is too large, thereby effectively protecting the safety of the single battery 11 .

[0066] It should be noted that the thickness of the thinned area 2114 is smaller than the thickness of the rest of the connecting part 211. Specifically, the ratio of the thickness of the thinned area 2114 to the thickness of the connecting part 211 is 0.25-0.67. At this time, in the event of overcurrent, local heat can be generated to fuse the connection between the first section 2111 and the second section 2112 to achieve the function of local disconnection, thereby ensuring the safety and reliability of the battery pack. At the same time, the overall structural rigidity of the connecting part 211 can also be ensured.

[0067] It should be noted that the numerical range of the ratio of the thickness of the thinned area 2114 to the thickness of the connecting portion 211 can be: any value among 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.67 or a range between any two values.

[0068] It should also be noted that the thinning area 2114 can be set between the first section 2111 and the second section 2112, or can be set in the first section 2111 or in the second section 2112, and can be thermally melted when an overcurrent occurs.

[0069] In the embodiment of the present application, the current exceeds the threshold value, which can be set according to the overcurrent capacity and heating conditions of the connection part 211 of the battery pack, and is not specifically limited.

[0070] like Figure 6 As shown, in some embodiments, the first section 2111 has a second through hole 21111 , the second through hole 21111 penetrates the first section 2111 along the third direction Z, and the second through hole 21111 is exposed from the first through hole 221 close to the first section 2111 .

[0071] In the embodiment of the present application, by setting the second through hole 21111 in the first section 2111, it can be used to determine whether the first section 2111 is located on the side of the first electrode 112 away from the main body 111 along the third direction Z through the second through hole 21111, so as to realize the mutual positioning of the first section 2111 and the first electrode 112, thereby facilitating the welding connection between the first electrode 112 and the first section 2111, and ensuring that the connecting portion 211 is connected to the single battery 11 at a preset position.

[0072] It should be noted that the first through hole 221 needs to be connected to the second through hole 21111, that is, the second through hole 21111 needs to be within the range of the first through hole 221, so that the first electrode 112 exposed from the second through hole 21111 can be observed through the first through hole 221, thereby facilitating the mutual positioning and welding of the first section 2111 and the first electrode 112.

[0073] It should be noted that a positioning mark may be further provided on the side of the first electrode 112 away from the body 111 . In this case, the first electrode 112 and the first segment 2111 may be more accurately positioned by exposing the positioning mark from the second through hole 21111 .

[0074] like Figure 7 As shown, in some embodiments, the flexible circuit board 22 includes a plurality of acquisition lines 222, each acquisition line 222 is conductively connected to a connection portion 211, wherein a portion of the acquisition lines 222 is located on one side of the first through hole 221 along the second direction Y, and another portion of the acquisition lines 222 is located on the other side of the first through hole 221 along the second direction Y.

[0075] In the embodiment of the present application, by setting a first through hole 221 in the middle of the flexible circuit board 22, the acquisition lines 222 can be routed on both sides of the first through hole 221 respectively. Figure 7 As shown, at this time, when there are more single cells 11 in the battery pack 1 and thus more acquisition lines 222, the acquisition lines 222 can be arranged in a staggered manner on both sides of the first through hole 221 along the second direction Y according to the arrangement sequence of the single cells 11. Compared with single-sided wiring, the single-sided wiring width can be reduced. At this time, the blocking of the connection end of the connecting portion 211 can be reduced or even avoided, so that the connection area between the single cell 11 and the connecting portion 211 can be guaranteed.

[0076] Please refer to Figure 2 , Figure 4 , Figure 6 and Figure 7 In some embodiments, the battery pack has a second direction Y intersecting the first direction X and the third direction Z respectively, the battery pack includes a plurality of battery groups 1, and the plurality of battery groups 1 are arranged along the second direction Y; the bus assembly 2 includes a plurality of connectors 21, and the plurality of connectors 21 are arranged at intervals along the first direction X; along the third direction Z, the plurality of connectors 21 are arranged between the plurality of battery groups 1 and the flexible circuit board 22; the connectors 21 are respectively connected to the plurality of battery groups 1 and the flexible circuit board 22; the connector 21 includes at least one adapter 212 and a plurality of connectors 211 arranged at intervals along the second direction Y; each adapter 212 is arranged between two adjacent connectors 211 along the second direction Y, and is respectively connected to the two connectors 211, so that two adjacent single batteries 11 along the second direction Y are connected in parallel; along the third direction Z, one connector 211 of the connector 21 is located between the flexible circuit board 22 and a battery group 1, and the connector 211 is exposed from two adjacent first through holes 221 of the flexible circuit board 22.

[0077] In the embodiment of the present application, by providing a busbar assembly 2 including a plurality of connectors 21, and the connectors 21 including a plurality of connection portions 211 and a transfer portion 212, it is possible to connect a plurality of single cells 11 in a plurality of battery packs 1 in series and / or in parallel, which is beneficial to achieving a large current and a large voltage output of the battery pack.

[0078] Specifically, a battery pack can be provided with multiple battery packs 1, which can improve the capacity and endurance of the battery pack. The connector 21 includes multiple connectors 211 and adapters 212. At this time, the multiple connectors 211 are connected through the adapters 212. The multiple connectors 211 are arranged at intervals along the second direction Y, and the first sections 2111 of the multiple connectors 211 are respectively connected to the first electrodes 112 of the multiple single cells 11 of the multiple battery packs 1 arranged along the second direction Y. At this time, the multiple single cells 11 connected to the connector 21 can be connected in parallel through one connector 21; the second sections 2112 of the multiple connectors 211 are respectively connected to the first electrodes 112 of the multiple battery packs 1 arranged along the second direction Y. The second electrodes 113 of the plurality of single cells 11 arranged in the second direction Y are connected one by one, and at this time, the plurality of single cells 11 connected to the plurality of second sections 2112 of the connector 21 are also connected in parallel; one connecting portion 211 connects the first electrodes 112 and the second electrodes 113 of two single cells 11 adjacent along the first direction X, and at this time, the two single cells 11 adjacent along the first direction X are connected in series; therefore, one connector 21 can realize the parallel connection of a column of single cells 11 arranged along the second direction Y, and at the same time, can realize the series connection of two columns of single cells 11 arranged along the first direction X. Therefore, one connector 21 of the embodiment of the present application can realize the connection between the plurality of single cells 11 of the plurality of battery packs 1, and the embodiment of the present application can realize the series and / or parallel connection between the single cells 11 of the plurality of battery packs 1 in the battery pack by setting the busbar assembly 2 with the plurality of connectors 21.

[0079] It should be noted that, along the third direction Z, a connecting portion 211 of the connecting member 21 is located between the flexible circuit board 22 and a battery pack 1, and the connecting portion 211 is exposed from two adjacent first through holes 221 of the flexible circuit board 22, and the other connecting portions 211 are not between the flexible circuit board 22 and the battery pack 1, and are exposed on both sides of the flexible circuit board 22, so that the shielding of the connecting member 21 by the flexible circuit board 22 can be reduced, and at this time, the first section 2111 and the second section 2112 of all the connecting portions 211 of the connecting member 21 can be smoothly welded and connected with the corresponding first electrode 112 and second electrode 113; at the same time, the multiple connecting portions 211 of the connecting member 21 realize the parallel connection of multiple single batteries 11 arranged along the second direction Y, so that the voltage at each location is the same, so that only one collection line 222 of the flexible circuit board 22 is needed to collect the voltage, and the flexible circuit board 22 does not need to cover all the single batteries 11, so that the size of the flexible circuit board 22 along the second direction Y can be effectively reduced, thereby reducing the material usage of the flexible circuit board 22 and reducing the cost.

[0080] At the same time, it should be noted that the parts of the flexible circuit board 22 located on both sides of the first through hole 221 along the second direction Y are respectively located between two adjacent connecting parts 211, and will not cover both ends of the connecting part 211, so as not to affect the pre-grouping of the busbar assembly 2 and the subsequent welding connection with the single battery 11. Both sides have a certain width for wiring the collection line 222, which can increase the distance between two adjacent collection lines 222 and avoid interference between adjacent collection lines 222.

[0081] It should also be noted that the flexible circuit board 22 is not only used to collect voltage signals, but also to collect temperature signals. Therefore, the collection line 222 of the flexible circuit board includes a voltage collection line and a temperature collection line. The temperature collection requires the connection of a temperature sensor. In this case, the temperature sensor can be welded through an additional wire, and then the wire is connected to the temperature collection line in the flexible circuit board 22. This facilitates the collection of temperature signals. In this case, the temperature sensor can be arranged at any position according to requirements. Among them, the temperature sensor does not need to be welded to the single battery 11 of the battery pack 1, and the temperature can be collected only by heat transfer.

[0082] like Figure 3As shown, in some embodiments, the busbar assembly 2 further includes a first insulating layer 23 and a second insulating layer 24, the first insulating layer 23 is disposed between the connecting portion 211 and the single battery 11, and is connected to the connecting portion 211; the first insulating layer 23 has a plurality of third through holes 231 extending along a third direction Z, and the orthographic projections of the first segment 2111 and the second segment 2112 on the first insulating layer 23 are respectively located in two adjacent third through holes 231; the second insulating layer 24 is disposed on a side of the flexible circuit board 22 away from the connecting portion 211, and is respectively connected to the flexible circuit board 22, the connecting portion 211 and the first insulating layer 23; the second insulating layer 24 has a plurality of fourth through holes 241 extending along a third direction Z, and the orthographic projections of the first segment 2111 and the second segment 2112 on the second insulating layer 24 are respectively located in two adjacent fourth through holes 241.

[0083] In the embodiment of the present application, by providing the first insulating layer 23 and the second insulating layer 24, it is possible to package the connector 21 and the flexible circuit board 22 along the third direction Z, thereby ensuring the insulation of the connecting portion 211 except for the connecting portion 211 with the single battery 11, and at the same time realizing the bus assembly 2 to form a whole, which is convenient for overall movement and welding and assembly with the battery pack 1, effectively simplifying the battery pack assembly process, reducing the difficulty of battery pack assembly, and improving the safety of the battery pack.

[0084] Accordingly, an electrical device according to an embodiment of the present application includes a battery pack as described in any one of the aforementioned embodiments, and the battery pack is used to supply power to the electrical device.

[0085] It can be understood that the electrical device includes all the technical features and technical effects of the battery pack, which will not be repeated here.

[0086] Of course, the electrical devices referred to in this application may be application devices such as vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools. Vehicles may be new energy vehicles, which may be pure electric vehicles, hybrid electric vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of this application do not impose any special restrictions on the above-mentioned electrical devices.

[0087] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0088] The above is a detailed introduction to a battery pack and an electrical device provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: Having intersecting first and third directions, including: A battery pack, comprising a plurality of single cells arranged along a first direction; A bus assembly is arranged on one side of the battery pack along the third direction and connected to the battery pack; the bus assembly includes: A plurality of connection parts are arranged on one side of the battery pack along the third direction, each of the connection parts being connected to two adjacent single batteries along the first direction; A flexible circuit board is arranged on a side of the connecting portion away from the battery pack and is conductively connected to the connecting portion; the flexible circuit board has a plurality of first through holes arranged along the first direction, and the first through holes penetrate the flexible circuit board along the third direction; and a portion of the positive projection of the connecting portion on the flexible circuit board is located in two adjacent first through holes.

2. The battery pack according to claim 1, characterized in that: The single cell battery comprises: ontology; A first electrode is disposed on a side of the body facing the busbar assembly and is conductively connected to the body; A second electrode is disposed on a side of the body facing the busbar assembly and is conductively connected to the body; a portion of the first electrode is protrudingly disposed on a side of the second electrode facing the busbar assembly; Two adjacent single cells connected to one connecting portion are respectively a first cell and a second cell, and the connecting portion comprises: A first section connected to a first electrode of the first battery; A second section is arranged at one side of the first section along the first direction and connected to the first section; the second section is connected to the second electrode of the second battery, so that the first battery and the second battery are connected in series; Wherein, at least part of the orthographic projection of the first segment on the flexible circuit board is located in a first through hole adjacent to the first segment; at least part of the orthographic projection of the second segment on the flexible circuit board is located in a first through hole adjacent to the second segment.

3. The battery pack according to claim 2, characterized in that: The battery pack has a second direction intersecting the first direction and the third direction respectively; the second section includes: a main body segment, connected to the first segment; an extension section, arranged at one side of the main section along the second direction and connected to the main section; an end of the extension section away from the main section is bent along the first direction toward a direction away from the first section; Wherein, the orthographic projections of at least a portion of the main body segment and the extension segment on the flexible printed circuit board are located within one of the first through holes.

4. The battery pack according to claim 3, characterized in that: The connecting portion includes a transition section, one end of the transition section is connected to the first section, and one end of the transition section away from the first section is connected to the second section, so that the second section is connected to the second electrode, and the first section is located on a side of the first electrode away from the body along the third direction.

5. The battery pack according to claim 2, characterized in that: The connecting portion has a thinned area, the thinned area is disposed in the first section, and the thinned area is configured to be melted when a current passing through the connecting portion exceeds a threshold value.

6. The battery pack according to claim 3, characterized in that: The first section has a second through hole, the second through hole penetrates the first section along the third direction, and the second through hole is exposed from the first through hole close to the first section.

7. The battery pack according to claim 3, characterized in that: The flexible circuit board includes a plurality of collection lines, each of which is conductively connected to one of the connecting parts, wherein a portion of the collection lines is located on one side of the first through hole along the second direction, and another portion of the collection lines is located on the other side of the first through hole along the second direction.

8. The battery pack according to claim 1, characterized in that: The battery pack has a second direction intersecting the first direction and the third direction respectively, the battery pack includes a plurality of the battery packs, and the plurality of the battery packs are arranged along the second direction; The busbar assembly comprises: A plurality of connectors are arranged at intervals along the first direction; along the third direction, the plurality of connectors are arranged between the plurality of battery packs and the flexible circuit board; the connectors are respectively connected to the plurality of battery packs and the flexible circuit board; the connector comprises a plurality of adapters and a plurality of connectors arranged at intervals along the second direction; each adapter is arranged between two adjacent connectors along the second direction and is respectively connected to the two connectors, so that two adjacent single batteries along the second direction are connected in parallel; Along the third direction, one connecting portion of the connecting member is located between the flexible circuit board and one of the battery packs, and the connecting portion is exposed from two adjacent first through holes of the flexible circuit board.

9. The battery pack according to claim 2, characterized in that: The busbar assembly further comprises: A first insulating layer is disposed between the connecting portion and the single battery and connected to the connecting portion; the first insulating layer has a plurality of third through holes extending along the third direction, and the orthographic projections of the first segment and the second segment on the first insulating layer are respectively located in two adjacent third through holes; The second insulating layer is arranged on a side of the flexible circuit board away from the connecting portion, and is respectively connected to the flexible circuit board, the connecting portion and the first insulating layer; the second insulating layer has a plurality of fourth through holes extending along the third direction, and the orthographic projections of the first segment and the second segment on the second insulating layer are respectively located in two adjacent fourth through holes.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-9.

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